Gefran WD SERIES Data Sheet
OIL-FILLED MELT PRESSURE TRANSMITTERS
WD SERIES DP404 CAN OPEN digital output
The WD series of Gefran, are pressure transmitters for
using in High temperature environment.
The main characteristic of this series is the capability to
read temperature of the media up to 315°C.
The constructive principle is based on the hydraulic trasmission of the pressure.
The fluid-filled system assures the temperature stability.
The phisical measure is transformed in a electrical measure by means the strain-gauge technology.
MAIN FEATURES
Electrical
• Digital output signal with DP404 CAN OPEN communication protocol
• Transmission frequency (Baud rate): 10 Kbaud to 1Mbaud
(default 500 Kbaud)
• Software selection of Baud rate and ID nodes
• Operation with 1 or 2 settable alarm limits
• “Autozero” for temperature compensation
• Zero and span drift compensation
• 80% FSO calibration signal
• Filling with certifyd oil FDA, CFR178.3620 and
CFR172.878
Mecanical
• Pressure ranges: 0-35 to 0-1000 bar/0-500 to 0-15000 psi
• Precision: < ± 0.25% FSO (H); < ±0.5% FSO (M)
• Extensimetric measurement principle with Wheatstone
jumper
• Hydraulic transmission system to guarantee temperature stability (diathermic oil). Filling with certifyd oil FDA,
CFR178.3620 and CFR172.878
• Quantity of oil contained for model:
series WD0 (30mm3); series WD1,WD2,WD3 (40mm3)
• Standard threading: 1/2-20 UNF, M18x1.5; other versions
on request
• Autozero function by software
• Stainless steel 17-7 PH diaphragm with GTP+ coating
GTP+ (advanced protection)
Coating with high resistance against corrosion, abrasion
and high temperature
TECHNICAL SPECIFICATIONS
Rated precision, including effects of
linearity, repeatability and hysteresis
Sampling
Pressure ranges
Maximum applicable pressure
Measurement principle
Power supply
Typical input
Insulation resistance (at 50Vdc)
Signal at rated pressure (FSO)
Signal at ambient pressure
Calibration of ambient pressure
Signal protocol
Response time (10 at 90% FSO)
Electronic response time
(10 at 90% FSO)
Calibration signal
Protection against overvoltage and
reverse polarity of power supply
Compensated temperature range of
strain Gauge Housing
Maximum temperature range of
strain Gauge Housing
Thermal drift in compensated range;
Zero
Calibration
Sensitivity
Max. diaphragm temperature
Influence due to variation of fluid
temperature (zero)
Standard Material in contact
with process medium
Thermocouple (model WD2)
Protection level
Electrical connections
H < ±0.25%FSO (350…1000 bar)
M < ±0.5%FSO (35…1000 bar)
0-500 to 0-15.000 psi
0-35 to 0-1000 bar
Depends on FSO
Insertion of an offset
DP404 CAN OPEN, with baud
rate selectable from 10K to
1M baud (default 500 Kbaud)
Diaphragm:
• 17-7PH corrugated diaphragm
with GTP+
Stem
• 17-4 PH
STD: Type * J (isolated coupling)
M12 DIN EN 50044 5-pin
16 bit (1)
2 x FSO
Strain gauge
12…40 Vdc
20 mA (2)
>1000 MOhm
0
20 ms
2 ms
80%FSO
YES
0…+85°C
32…+185°F
-30…+105°C
-22…+221°F
<0.02 %FSO/°C
<0.01 %FSO/°F
<0.01 %FSO/°F
315°C (600°F)
0.04bar/°C
30 Psi/100°F
IP65
connector
(1) resolution: 0.01 bar from 35…500bar; 0.1 bar from 700…1000bar;
0.1 psi from 5000…350psi; 1 psi from 7500…15000psi
(2) Conditions: Power supply 24 Vdc
FSO = Full Scale Output (Signal at rated pressure)
MECHANICAL DIMENSIONS
WD0
D1
D2
D3
D4
D5
A
B
C
WD2
1/2 - 20UNF
ø7.8 -0.05
[ ø0.31” -0.002 ]
ø10.5 -0.025
[ ø0.41” -0.001 ]
ø10.67
[ ø0.42” ]
ø12.7
[ ø0.5” ]
5.56 -0.26
[ 0.22” -0.01 ]
11.2
[ 0.44” ]
15.74
[ 0.62” ]
WD1
Ch
[Hex]
D1
D2
D3
D4
D5
A
B
C
Ch
[Hex]
16
[ 5/8” ]
M18x1,5
ø10 -0.05
[ ø0.394” -0.002 ]
ø16 -0.08
[ ø0.63” -0.003 ]
ø16 -0.4
[ ø0.63” -0.016 ]
ø18
[ ø0.71” ]
6 -0.26
[ 0.24” -0.01 ]
14.8 -0.4
[ 0.58” -0.016 ]
19
[ 0.75” ]
19
[ 3/4” ]
WD3
Exposed
capillary
D1 1/2-20UNF
D2 .307/.305”
[7.80/7.75mm]
D3 .414/.412”
[10.52/10.46mm]
A .125/.120”
[3.18/3.05mm]
B .318/.312”
[8.08/7.92mm]
C .81”
[20.6mm]
NOTE : dimensions refer to rigid stem length option “4” (153 mm – 6”)
WARNING : For installation use a maximum tightening torque of 56 Nm(500 in-lb)
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